Brake



g- 1932- G. K. MGCZANN 1,875,079

BRAKE Filed Feb.'l6, 1928 2 Shets-Sheet 1 INVENTOR ATTORNEY Aug. 30,1932. G. K McCANN 1,875,079

BRAKE Filed Feb. 15, 1928 ZSheets-Sheet 2 I INVENTOR I "*L 6504 056;7/Vf

TTORNEY atented Aug. 30, 1932 UNITED STATES PATENT OFFICE tEORGE MCCANN,OF SOUTH BEND, INDIANA, ASSIGNOR TO BENDIX BRAKE COM- PANY, OF SOUTHBEND, INDIANA, A. CORPORATION OF ILLINOIS BRAKE Application filedFebruary 16, 1928. SerialNo. 254,651,

This "invention relates to brakes and the kc, and is illustrated asembodiedin novel heft-operating means for applying a front 'heel brake.An object of the invention is 9 provide simple and efficient mechanismwhich can be manufactured economically.

One feature of the invention relates to an nproved shaft-operating arm,preferably orm'ed from sheet steel, which has a portion )oped about theshaft and extended to form double-thickness operating arm. The )opedportion is clamped upon the shaft by ontracting it with a bolt, or otherclampig means, engaging spaced parallel portions t one side of theshaft. I prefer to arrange or rea'dy adjustment by threading or otherisemounting a novel thrust member transersely of the end of theabove-described doulc-thickness portion of the arm.

Another feature of the invention relates to novel floating lever orlevers operated by a rank arm on the shaft, and having rollers r thelike thrust parts engaging the shoes. referably the rollers are carriedby two :amped levers whiehembrace the ends of the does to hold themlaterally. 3

The above and other objects and features f the invention, includingvarious novel c0111- inat-ions of parts and desirabledetails ofanstruction, will be apparent from the foliwing description of theillustrative embodiients shown in the accompanying drawings, 1 which:

Figure 1 is a partial vertical section irough the brake, just inside thehead of the rake drum, and showing the brake shoes 1 side elevation;

Figure 2 is a partial vertical section on the ne 22 of Figure 1, showingthe operating iechanism of the brake;

Figure 8 is an enlarged rear elevation of ie novel stampedshaft-operating arm;

Figure 4 is an elevation of the arm, looklg from the left in Figure 3;

Figure 5 is an elevation of a modified arm, n-responding to Figure 4,but showing the in only partly finished;

Figure 6 is a similar view showing the odified arm finished and mountedon the iaft;

Figure 7 is a view of the arm of Figure 4, but provided with anadjusting device threaded transversely of its end;

Figure 8 is an elevation corres onding to Figure 3, but showing thearm 0Figure 7;

Figure 9 is a vertical section through the floating brake-applyinglever;

Figure 10 is a section through the floating lever on the line 10-10 ofFigure 9; and

Figure 11 is a detail view of part of the partly-formed lever of Figure5, looln'ng in the direction of the arrows 11-11 in Figure 5.

The illustrated brake includes a drum rotating with a wheel (not shown),and a stationary support such as a backing plate 22 mounted on the wheelknuckle 24 at the open side of the drum. The knuckle may be swiveled bya king-pin 26 or the like at the end of the usual axle 28. Within thedrum 20 is arranged the friction means of the brake, illustrated asincluding shoes 30 urged away from the drum by the usual return spring32.

The brake applying means preferably includes a shaft 34 journaled in abracket 36 secured to the backing plate 22, and having at its end acrank arm 38 extending radially inward of the brake, and having a pivot40 at its end.

The shoes 30 are forced apart against the drum by a floating lever orlevers mounted on the pivot 40, and illustrated as including two fiatstampings or levers 42 which have thrust parts such as shoe-engagingrollers 44 and 46 mounted betweenthem. As best shown in Figures 9 and10, these rollers may be journaled on pivot pins 48 which are shoulderedto space the levers 42 apart, so theywill not bind on the rollers, andwhich are riveted over on the levers 42 at their ends to form apermanent sub-assembly. As shown in Figure 1, the ends of shoes 30 mayextend between levers 42 in engaging the rollers, so that the levershold the shoe ends laterally.

Shaft 34 is shown operated byv a novel stamped operating arm engaged bythe rounded end of a lever 52 fulcrumcd on axle 28, the center ofcurvature of said end being in or immediately adjacent the axis ofkingpin 26 when the brake is applied.

The stamped arm shown in Figures 2-4 includes a looped portion 54embracing the serrated end of shaft 3&, and extended as adouble-thickness portion engaged by lever 52. At least adjacent shaft34, the two'thick nesses, while approximately parallel, are

spaced apart farenough for engagement with ,J a'clampbolt or the like56which canbe tightenedtocontract portion 540a the shaft. In thearrangement of Figures 5 and 6, the arm is formed by welding orotherwise fastening together two separately-formed stampings 58and 60forming a double-thickness arm-engaged by lever 52. The upper ends ofthese stampings are spread apart and formed with elliptical openings '62(Figures 5 and-11), and are then-formed toward each other (Figure 6) toform a looped portion 64 embracing shaft 34. Shaft 34 is formed with atransverse groove or keyway for aclamping bolt (i6passing throu hfittings 68 engaging the parallel spaced ends 70 of the t'wo-stampings.

. The arrangement of Figures 7 and-8 is the same as that of Figures 3and 4, except that a thrust part 72, formed with an enlarged head 74:for engagement with lever 52, is threaded or otherwise mounted in theend .of the double-thickness portion of the novel stamped operating arm.1

\Vhile several. illustrative embodiments have been described indetaiL-it is'not my intention to limit the scope of the invention. tothose particular embodiments, or otherwise than bv theterms of theappended claims.

' portion looped about the shaft and extended to forma (h'iublcthickness portion integral with the lo'o 'ied portion, the twothicknesses being arranged in spaced parallel relation with their endsengagingone' another, and a clamping member engaging the spaced parallelthicknesses and arranged to draw them together to contract the loopedportion about the shaft. v I

" 3. Operating means fora shaft compris '1ng,1n combination; asheet-metal arm including a'portion looped about the shaft and extendedto form a double-thickness portion 'integral with the looped portion andhaving at one side of the shaft parallel portions spaced a shortdistance apart and flapped end p01 tions, and-a clamping member engagingth spaced parallel portions and arranged t draw them together tocontract the loope portion about the shaft, together with a thrusmemberextending transversely of'said dot ble-thickness portion at theend opposite th shaft. 1

4. Op erating means for a shaft compri's ing, in combination, asheet-metal arm ir eluding a portion looped about the shaft an extendedto form a double-thickness portio integral with the looped portion, thetw thicknesses being parallel and spaced :1 shoi distance apart adjacentthe shaft and havin flat surfaces on their ends engaging one at other,and a clamping member engagingth spaced parallel thicknesses andarranged t draw t-hen'i together to contract the loope portion about theshaft, together with .thrust member extending transversely 0 saiddouble-thickncss portion 'at the end oppc site the shaft.

5. Operating means for a shaft comprising in combination, a sheet-metalarm includin a portion looped about the shaft andextende to form adouble-thickness portion integra with the looped portion and having atonside of'the shaft parallel portions spaced short distance apart, and aclamping membe engaging the spaced parallel portions and ar ranged todraw them together to contract th looped portion about the shaft.together wit a thrust member threaded transversel through saiddouble-thickness portion atth end opposite the shaft. j

6. Operating'ineans for a shaft comprising in combination,a sheet-metalarm including portion looped about the shaft and extende to formadouble-thickness portionintegra with the looped portion, thetwothickncsse being parallel and spaced ashort distanc apart at leastadjacent theshaft, and a clamp ing member engaging thespaced parallcthicknesses and'arra'ngcd to draw them tc gether to contract the loopedportion abou the shaft, together with a thrust membe threadedtransversely through said double thickness portion at the end oppositeth shaft. I Y

In testimony whereof, I have hereunt signed my name.

GEORGE K. MQCANN.

